Fresh 20.04 - second monitor is detected but can't be used

I have a fresh installation of Ubuntu 20.04 and I can't make my second monitor work. I've switched from nouveau to NVIDIA 460 and I can't make it work.

The monitor is detected but when I try to set "join displays" and click on apply, I can see that it immediately jumps back to the default settings.

I thought that I can set it up in NVIDIA settings but there is no such option.

When I run sudo nvidia-settings it returns this:

milano@milano-lenovo:~$ sudo nvidia-settings

(nvidia-settings:2456): GLib-GObject-CRITICAL **: 16:18:19.023: g_object_unref: assertion 'G_IS_OBJECT (object)' failed

ERROR: nvidia-settings could not find the registry key file. This file should have been installed along with this driver at /usr/share/nvidia/nvidia-application-profiles-key-documentation. The
       application profiles will continue to work, but values cannot be prepopulated or validated, and will not be listed in the help text. Please see the README for possible values and descriptions.

** Message: 16:18:19.079: PRIME: No offloading required. Abort
** Message: 16:18:19.079: PRIME: is it supported? no

I'm desperate since I can't figure out what todo. Do you have any ideas?